/* eslint-disable unicorn/no-abusive-eslint-disable */
/* eslint-disable */
// @ts-nocheck

// TODO: remove once refactored

const mul_table = [
  512, 512, 456, 512, 328, 456, 335, 512, 405, 328, 271, 456, 388, 335, 292, 512, 454,
  405, 364, 328, 298, 271, 496, 456, 420, 388, 360, 335, 312, 292, 273, 512, 482, 454,
  428, 405, 383, 364, 345, 328, 312, 298, 284, 271, 259, 496, 475, 456, 437, 420, 404,
  388, 374, 360, 347, 335, 323, 312, 302, 292, 282, 273, 265, 512, 497, 482, 468, 454,
  441, 428, 417, 405, 394, 383, 373, 364, 354, 345, 337, 328, 320, 312, 305, 298, 291,
  284, 278, 271, 265, 259, 507, 496, 485, 475, 465, 456, 446, 437, 428, 420, 412, 404,
  396, 388, 381, 374, 367, 360, 354, 347, 341, 335, 329, 323, 318, 312, 307, 302, 297,
  292, 287, 282, 278, 273, 269, 265, 261, 512, 505, 497, 489, 482, 475, 468, 461, 454,
  447, 441, 435, 428, 422, 417, 411, 405, 399, 394, 389, 383, 378, 373, 368, 364, 359,
  354, 350, 345, 341, 337, 332, 328, 324, 320, 316, 312, 309, 305, 301, 298, 294, 291,
  287, 284, 281, 278, 274, 271, 268, 265, 262, 259, 257, 507, 501, 496, 491, 485, 480,
  475, 470, 465, 460, 456, 451, 446, 442, 437, 433, 428, 424, 420, 416, 412, 408, 404,
  400, 396, 392, 388, 385, 381, 377, 374, 370, 367, 363, 360, 357, 354, 350, 347, 344,
  341, 338, 335, 332, 329, 326, 323, 320, 318, 315, 312, 310, 307, 304, 302, 299, 297,
  294, 292, 289, 287, 285, 282, 280, 278, 275, 273, 271, 269, 267, 265, 263, 261, 259,
];

const shg_table = [
  9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17,
  18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
  19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21,
  21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
  21, 21, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
  22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23,
  23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
  23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
  23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
  24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
  24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
  24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
];

function BlurStack() {
  this.a = 0;
  this.next = null;
}

// Derived from http://www.quasimondo.com/StackBlurForCanvas/StackBlur.js
export function stackBlurImageOpacity(imageData, top_x, top_y, width, height, radius) {
  if (Number.isNaN(radius) || radius < 1) {
    return;
  }
  radius = Math.trunc(radius);

  const pixels = imageData.data;

  let x, y, index, p, yp, yi, yw, a_sum, a_out_sum, a_in_sum, pa, rbs;

  const div = radius + radius + 1;
  const w4 = width << 2;
  const widthMinus1 = width - 1;
  const heightMinus1 = height - 1;
  const radiusPlus1 = radius + 1;
  const sumFactor = (radiusPlus1 * (radiusPlus1 + 1)) / 2;

  const stackStart = new BlurStack();
  let stack = stackStart;
  for (index = 1; index < div; index++) {
    stack = stack.next = new BlurStack();
    if (index == radiusPlus1) {
      var stackEnd = stack;
    }
  }
  stack.next = stackStart;
  let stackIn = null;
  let stackOut = null;

  yw = yi = 0;

  const mul_sum = mul_table[radius];
  const shg_sum = shg_table[radius];

  for (y = 0; y < height; y++) {
    a_in_sum = a_sum = 0;

    a_out_sum = radiusPlus1 * (pa = pixels[yi + 3]);
    a_sum += sumFactor * pa;
    stack = stackStart;

    for (index = 0; index < radiusPlus1; index++) {
      stack.a = pa;
      stack = stack.next;
    }

    for (index = 1; index < radiusPlus1; index++) {
      p = yi + ((widthMinus1 < index ? widthMinus1 : index) << 2);
      a_sum += (stack.a = pa = pixels[p + 3]) * (rbs = radiusPlus1 - index);
      a_in_sum += pa;
      stack = stack.next;
    }

    stackIn = stackStart;
    stackOut = stackEnd;
    for (x = 0; x < width; x++) {
      pixels[yi + 3] = pa = (a_sum * mul_sum) >> shg_sum;

      a_sum -= a_out_sum;
      a_out_sum -= stackIn.a;

      p = (yw + ((p = x + radius + 1) < widthMinus1 ? p : widthMinus1)) << 2;
      a_in_sum += stackIn.a = pixels[p + 3];
      a_sum += a_in_sum;

      stackIn = stackIn.next;

      a_out_sum += pa = stackOut.a;

      a_in_sum -= pa;

      stackOut = stackOut.next;

      yi += 4;
    }
    yw += width;
  }

  for (x = 0; x < width; x++) {
    a_in_sum = a_sum = 0;

    yi = x << 2;
    a_out_sum = radiusPlus1 * (pa = pixels[yi + 3]);
    a_sum += sumFactor * pa;

    stack = stackStart;

    for (index = 0; index < radiusPlus1; index++) {
      stack.a = pa;
      stack = stack.next;
    }

    yp = width;

    for (index = 1; index <= radius; index++) {
      yi = (yp + x) << 2;

      a_sum += (stack.a = pa = pixels[yi + 3]) * rbs;

      a_in_sum += pa;

      stack = stack.next;

      if (index < heightMinus1) {
        yp += width;
      }
    }

    yi = x;
    stackIn = stackStart;
    stackOut = stackEnd;
    for (y = 0; y < height; y++) {
      p = yi << 2;
      pixels[p + 3] = pa = (a_sum * mul_sum) >> shg_sum;

      a_sum -= a_out_sum;
      a_out_sum -= stackIn.a;

      p = (x + ((p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1) * width) << 2;
      a_sum += a_in_sum += stackIn.a = pixels[p + 3];
      stackIn = stackIn.next;
      a_out_sum += pa = stackOut.a;

      a_in_sum -= pa;

      stackOut = stackOut.next;

      yi += width;
    }
  }
  return imageData;
}
